Grinding-wheel-trimming mechanism for gear-truing machines.



No. 888,675. PATENTED MAY 26, 1908. F. A. WARD 62w. N. TAYLOR. GRINDING WHEEL TRIMMING MECHANISM FOR GEARTRUING MACHINES.

APPLICATION FILED MAR. 27. 1907.

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I PATENTED MAY 26, 1908.

P. A.. WARD & W. N. TAYLOR. GRINDING WHEEL TRIMMING MECHANISM FOR GEAR TRUING MACHINES.

APPLICATION FILED MAR. 27, 1 .907-

4 SHEETS-SHEET 2.

INVENTOR.

WFI'NESSES: G. MI W a ma? No. 888,675. PATENTED MAY 26, 1908.

F. A. WARD & W. N. TAYLOR. GRINDING WHEEL TRIMMING MECHANISM FOR GEAR TRUING MACHINES.

APPLICATION FILED MAR. 27, 1907.

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INENTOR. t7,

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4 SHEETS-SHEET 4 PATENTED MAY 26, 1908. F. A. WARD & w. N. TAYLOR. GRINDING WHEEL TRIMMING MECHANISM FOR GEAR TRUING MACHINES;

n ll APPLICATION FILED MAR. 27, 1907.

lNVENTOR JLM 01;? I

WITNESSES: 29' (2% W6 7,41 ,155

UNITED s'rnrrps PATENT/OFFICE.

FREDERICK A.-WARD AND WILLIAM N. TAYLOR, OF TOLEDO, OHIO, ASSIGNQRS TO THE GEAR GRINDING MACHINE COMBAN Y, OF DETROIT, MICHIGAN, A CORPORATIONOF MICHIGAN.

GRINDING-WHEEL-TRIMMING MECHANISM FOR GEAR-TRUING MACHINES.

Patented May 26 1908.

Application filed March 27, 1907. Serial No. 364,855.

To all whom it may cull/66TH.

Be it known that we, FREDERICK A. WARD.

and WILLIAM N. TAYLOR, citizens of the United States, and residents of Toledo, in

the county of Lucas and State of Ohio, have invented a certain new and useful Grinding-FVheel-Trimming Mechanism for Gear- Trumg Machines; and we do hereby declare the following to be a full, clear, and exact 1 o description of the invention, such as will en, able others skilledin the art to which it ap pertains to make and use the same, reference being had to the accompanying drawings,' and to the figures and letters of reference marked thereon, which form a part of this specification- Our lnvention relates to grinding machines, and has reference more particularly to means for use in gear trimming or grinding 2o machines for trimming or truing the grinding-medium thereof after operating on the teeth of a gear.

Considerable difficulty has been experienced-in the manufacture of gears due to the warping thereof, which invariably occurs during the hardening or tempering process. This warping, while it maybe very slight, is very perceptible in a running thereof, causing what may be termed, a noisy or rattling gear, which is most objectionable when present in the-gearing of automobiles or other machines in which quietness and smoothness of running is desired. Attempts have been made to true the gear teeth after the tempering thereof by passing i a grinding-medium across the same, but

these so far as we are aware have all been impractical and unsuccessfuldue to the absence of means for trimming the grindingeomedlum to compensate for the wear occa 'sioned by each grinding operation.

The object of our invention is to obviate the above difficulties and to make the mechani'cal truing of gears possible by the provision, incombination with a revolving ming the gear-coactirig surface of the grinding-medium after each operation to cause it to conform to the shape and size of the teeth acted on, so that when the trimming or tru-. ing of the gear is completed the contour of each tooth conformsexactly to that of all the others.

A further object of our invention is the provision of'simple and eflicient means for v size of the grinding-medium after each-opera tion on the gear. 7

The operation, construct1on,and arrangement of the parts of the invention are fully described in the following specification, and

illustrated in the accompanying drawings,

in which,'

Figure 1 is a side elevation of a machine embodying the features of our invention. Figs. 2 and 3 are partial transverse sections of the same taken, respectively, on the dotted lines a w and x :10 in Fig. 1, the .former showing the rear trimmers elevated as they a pear immediately after makings. cut,and t e latter showing both sets of trimmers in lowered or normal position. Fig. 4 is an elevation of the end of the machine carrying the work,'witl1 portions broken away. Fig. 5 is an enlarged partial elevation of the opposite line y y in Fig; 9. Fig. 9 is an end elevation of the same with the grindingmedium re-' side of said end portion to that shown in-Fig.

moved, and Fig. 10 is a transverse section taken on the dotted line '0 o in Fig. 2'.

. Referring to the drawings, 1 designates the i frame, which isprovided at one end With the elevated portion 1 carrying the grinding parts and at the other end with the elevated portion 1", carrying the work mandrel and av portion of its controlling'parts.

The frame ortion 1 is formed on its top with a longitu inally extending slide-way 2 on which a carriage 3 is mounted for longitudinal movement relative to the frame to permit the'grinding-wheel 4-, which is revolubly carried at its inner end, to be moved forward and backward across the face of the gear wheel 5, which latter is carried as hereinafter described. The grinding-wheel 4 is journaled in a bracket 6, which is'. slidingly car ried by a head 3 formed at the inner end of the carriage 3, for vertical adjustment relative to the plane of movement 'ofthe tarriage. This adjustment is effected at each in Figs. 8 and 9. This incasing member is loosely mounted on the screw-shaft and has an arm 10 projecting therefrom in position for a screw 11 thereon to have contact with an alining ortion of the slide-way 2 just prior to the 'mit of return or rearward movement of the carriage, whereby to impart a predetermined degree of revolution to the screw-shaft 7, the dotted lines in-Fig. 8 illustrating'the action of said parts. The arm 10 is normally retained at its limit of inward movement relative to the carriage 3. by a coiled contraction spring 12, secured as shown in Fig. 8, and this inward movement is regulated bya-contact screw 13 carried by the arm. It is apparent that each lowering movement of the grinding-wheel is .very

slight, being only sufficient for the trimming madenecessary by the wear after a grinding operation, and that such movement is regulated by the number of threads perinch on the screw 7, the number of teeth on the ratchetwheel 8, and the throw giventhe pawl 9.

The grinding-wheel 4 is driven by a belt 14, which connects the sheave 15 on the wheel 3 shaft and thedrive-sheave 16 carried by a line or other suitably driven shaft. The

course of the belt is guided intermediate the sheaves 15 and 16 by thetwo sheaves 17, 17, which are carried at the rear or outer end of the carriage 3, as shown in Fig. 1. The requisite longitudinal movement is imparted to the carriage 3 from the rotary movement of a drum 18, which is mounted on the shaft19 beneath the carriage, due to an idlerroll 20, I carried at the under side of the carriage, traveling in a cam groove 21 formed in the circumference of the drum, said groove being sha d as hereinafter more particularly descri ed. A gear-wheel 22 is carried at.the 5 outer end of the shaft 19, and has connection through suitable intermediate gearing witha source of power. A

Supported by the frame 1 intermediate the elevated portions 1 and 1 thereof is the frame part 23, 'which in turn supports the standard or bracket 24. This standard or bracket has-its forward faces formed with a horizontal groove 25 in each end of which is A slidingly mounted a block 26, which blocks are yieldingly spaced apart bya coiled comresslon spring 27 .and are relatively adjusted YQd HSiJIDg-SCIGWSQS, as best shown in Fig. 10 ecured to the forward or outer face of each block 26 by a bolt or stem passing 5 through it and a horizontal slot in the stand-- the lower arc of the grinding-wheel 4 on opard and receiving a nut at the rear end, is a vertical socket 30, which carries a vertically adjustable post 31. The lower end of each socket is closed by a plu 32 through which an adjusting-screw 33 is t ireaded, said screw 79 coactmg with a spring-retainer 34, which is threadedto the lower end of the post-'31 and receives the thrust of the lower end of a coiled compression-sprin 35. This springl encircles the post and as its upper en thrust against a shoulder in the socket, as shown in Fi 2. The post is locked in adjusted position by a bolt 36, which passes through the retainer 34. and alining vertical slots in the socket wall, as shown.

The up er end of the posts31 terminate in horizonta y disposed bearing heads 37, which are disposed in contiguous position to p'osite sides thereof and in eachofwhich is mounted a rock-shaft 38. Radially projecting from the forward ends of the shafts 38 are the two opposing rear diamond-holders 39, each of which carries at one end a diamond 40 for coactin with and trimming the contiguous are a, o the grinding wheel Each diamond-holder 39 passes through a collar 41 carried by the shaft and is secured inadjusted position bya set-screw 42. These holders are intended to be so adjusted rela- 5 tive to the grinding-wheel, when at its limitof rearward movement, that the axis of each coincides with the axis of the contiguous are a ofthe wheel, thus causin them, when 0 erated, to effect a superficia ,trimming of t e surfaces 0., a immediately after each lowering movement of the wheel. H

Projecting inwardly from the rear end of .each shaft 38' is an arm 43, which arms have their inner ends lapping each other and slot-- ted, as shown, to receive a common in 44 carried at the upper end of the vertic pushrod 44, so that a vertical reciprocatory movement of the rod will'impart a simultaneous rocking motion to the two shafts 38 and their diamond-holders 39. This rod passes down through a hole in the standard 24 and frame part 23 and has its lower end terminating in position to coact with the conical face'ofa collar 45, which'is slidingly carried by a shaft 15 46, whereby as said collar is movedfrom its normal position, by ,means hereinafter described, the rod is raised against the tension of the coiled compression-s ring 44 to efi ect an, upwardmovement of t e rear trimmer- .diamonds 40 to trim the arcs a, a of the grinding-wheel. The conical collar 45 is returned to its normal position by the action of the coiled compression-spring 47, which is mounted on the shaft 46 intermediate said collar and the cam-faced collar 48, which is fixed to said ''-shaft and has an additional function hereinafter described.

During theoperation of the rear trimmerdiamonds 40 on theivheel 4 the idler-roll 20 0 of the carriage3 is traveling in the neutral zone a. of the cam groove 21 in the drum 18, and at the end of such zone enters the inclined or diagonally disposed portion?) of the roove, which causes the carriage to move orward until the'axis of the grindin -wheel stands in vertical alinement with t e two front trimmer-diamonds 49. At this point the idler-roll 20 enters a second neutral zone 22 of the guiding-groove and effects a momentary pause ofthe carriage and grinding-wheel to permit said front trimmer-diamonds to act on the wheel before the idler-roll enters the inclined or diagonally-disposed portions'd of 5 the guiding-groove, which moves the carriage 3 forward sufficiently for the wheel 4 to traverse across the face of the gear 5 for the purpose of truing the contiguous faces of two of its teeth. The guiding-grooves 21 at the end of the diagonal portion 11 thereof is formed with a return bend and continues around the drum fdrming a reverse diagonal course which meets the neutral zone a, thereof, "thus returning the grinding-wheel to 25 again be trimmed.

Mounted for reciprocal vertical movement in the-socket-member 50, secured to the to of the frame art 23 in advance of the stan ard 24, is a pi said frame part 23 in position to coact with the cam surface of the collar 48 on the shaft 46, whereby a raising thereof is effected when the collar is turned. The upper end of said lunger or rod is projected to adjacent the ower edge of the grinding-wheel 4 when standing thereover and is bifurcated to form the two arms 52, 52, each of which carries one of the front trimmer-diamonds 49 at its free end in position for their points to abut each other when the free ends of the arms are forced together and to have contact with the periphery or head of the grinding-wheel when the plunger is elevated. The plunger is prevented from turning in its socket by keys 53 which operate in registering grooves in the socket walls. A coiled compression sprin 54 encircles the plunger within an enlar e part of the socket, and has its up er en abutting against a shoulder in the soc et and its lower end coacting with a collar 55 on the plunger, thus tending to normally maintain the plunger in lowered position, as shown in Fig. ;2. The lowering movement of the 55 plunger is shown as being limited by a shoulder 51 thereon coacting with a cap 50 which is. secured to the upper end of the socket 50 and through which the plunger operates.

Mounted. on the socket-member 50 is a collar or head 56 from the opposite sides of which project the two upwardly extending arms 57, 57, the terminals of-which converge and each carries an idler roll 58 in position to 5 engage the outer face of. the contiguous arm unger or push-rod51, the lower 36 end of which is projected through the top of 52 of the'plunger. As the tendency of the arms 52 is to divergeor remain in open position so that the diamonds 49 would normally be separated, the coaction of the rolls 58 therewith is intended to produce a converging of the diamonds at a predetermined point in the movement of the plunger. For this purpose the arms are provided with the raised surfaces e with which the rolls 58 coact when thev lunger is down and continues to 'coact unti the plunger is raised sufficiently for the diamonds 49 to have contact 1 with the periphery or bead b of the grinding-..

wheel, at w ich pointthe arms begin to spread, due to the rolls passing to the abruptly reduced surfaces d/ of the arms, thus permitting the diamon s 49 to have a diverging movement transversely of the narrow face or bead b of therapidly revolving grinding-wheel whereby to trim the same.

The cam-collar 48, with which ,the lower end of the plunger or push-rod 51 coacts, is provided with an abrupt projection 48 by means of which the lunger is suddenly ele'.

tion-spring 61, which has one end fixed toa pin projecting from said collar and its other end fixed to a convenient portion of the frame, as shown in Fig. 3. The return or backward movement of the shaft is limited by a lug 62 on the collar 48 engaging a stop 63 secured to a contiguous frame portion.

The gear-wheel 5 to be trued is carried at the inner end of the horizontal arbor-shaft or mandrel 64, which is journaled in the elevated portion 1 of the frame and carries the index-wheel or disk 65 at its outer end. The, mechanism shown in Figs. 1, 4, 5, 6 and 7 by means ofwhich the index wheel is moved with mechanical precision through any required ortion of a revolution and locked in any adjusted position consists in loosely mounting a ratchet Wheel 66 on the mandrel 64 within a housing or casing 67 on the inner face of the index-wheel 65. This ratchetwheel has an arm 68 radially projecting therefrom through a suitable opening in the casing 67 and when moved by a raisin of said arm has its teeth engaged by a springpressed pawl 69 which is carried by the housmg 66 of the index-wheehso that movement is communicated thereby to the latter. An

adjustable rod 70 connects the arm 68 with' an arm 71 projecting fgrlii the disk-like member 72, which is loosely ourited on the rockshaft 73 without the frame 1. The arm 71 has its lowering movement limited by aradial lug 74 on the member 72 coacting with a stop-screw 75 carried by the adjoining frame art. The shaft 73 is transversely journaled 1n the frame 1 beneath the arbor-shaft 64 and has a disk 76 fixed to its inner end within the 'frame 1, as shown in Fig.1, and an-arm 77 fined to its outer end in osition to coact with ascrew 78 carried bya ug 79 on the face of the member 72. When the shaft '73 is rocked, as hereinafter described, the arm 77,

after first having a limited movement relative to the member 72, engages the screw 78 thereon to impart the requisite turning movement to said member for the purpose of elevating the rod 7 0 to effecta movement of the index-wheel 65.

A rod or link 80- connects the disk 76 with the lower end of a lever 81 ,whichisfulcrumed to an arm 'projgcting from the frame -1 be neath the sha 46- and has its up er end forked and positioned. to engage the ugs 82, which project-in opposite directions from the the sleeve 83. This sleeve is slidingly carried by the shaft 46'beneath the drum 18, and car ries an idler-roll 84 for traveling in. the came groove 21 of the drum, whereby a rotation of the drum imparts a reciprocatory movement 'to the'sleeve. The sleeve is slotted, as at 83 to permit its forward end to move past the pin 59 on its shaft. point in the forward movement of the sleeve the lug's82 thereon engage the forked end of the lever 81, causing an oscillation thereof and a consequent partial rotation of the disk.

76 and shaft'7 3. In order to prevent a turning of the sleeve 83 an arm 83 -'projects from one side thereof and has its outer end forked to have a, sliding movement on a fixed bar 83, which is mounted in parallelism with the shaft 46,.as shown in Figs. 6'and 7. As the disk 76 is rotated an idler-roll 85 thereon moves upon a cam-surface 86 formed onth upper side of the arm 87, and causes a de- .pression of the arm, which depression is maintained during the remainder of the stroke. Thearm 87 is-pivoted at its rear end to aboss 88, projecting inwardly from one side of the frame 1, and has its forward end forked and embracing the grooved collar 89, which iscarried at the lower endof the vertical rod 90. This rod is mounted for vertical movement within a holder 91 secured'to the end of the frame. 1 and is. normally retained elevated by the-action of the spring 90 so thatits upper end engages one of the peri heral notches-65 in the indexwheel 65 w ereby to serve as-a stop therefor. The journal-box in which the arbor-shaft or mandrel 64 is mounted is vertically adjusted by a handscrew 92 to accommodate the ma-' chine tot he truin of different sized ears.

To permit of )this a justment the vertica rods I and90 oft e index-wheel controlling mech- At a predeterminedanism are both made longitudinally adjustable, as shown.

The sliding-sleeve 83 'on the shaft 46, in addition toscommunicating motion from the drum 18 to the lever 81 of the work-controlling mechanism, also serves as a means for actuating the movement of the conical collar 45 carried on the shaft 46 therewith, as it engages the end of said collar justp'rior to its (the sleeves) limit of forward movement, or approximately at the time 'the" idler-roll 20 of the carriage 3 enters the neutral zone a, of the cam-groove 21 thus effecting a forward movement of the collar 45 againstthe tension of the spring 47' and a properly timed raising of the push-rod 44 to operate the rear trimmer-diamonds 40.

' In Figs. 1, 2 and 3 is illustrated a suitable arm 94 for thereon so that when the shaft is at thelimit of inward movement the former only-is in position to engage its pin, and when at its limit of outward movement the latter only is in position to engage its pin. An operating handle 98 is carried at the outer end of the shaft. the shaft is proper direction an elevation of the push- It thus apparent that when rod 44 will be effected and when pulled out and similarly rocked an elevation of the plunger or push-rod 51 will be effected.

The operation of the machine isas follows: The work being positioned on the arborshaft or mandrel 64, which is pro erly adjusted to suit the size of the same, t e means driving thexge'ar-wheel 22 is own into ofieration to 1m art the proper'rotation to t e drum 18, w ch in turn communicates a properly timed longitudinal reciprocatory movement to the carriage 3 due to the idler roll 20 carried thereby traveling in the circumferential cam-groove 21 of'the'drum.

The forward movement of the carriage causes the rapidly revolving grinding-Wheel 4, carried thereby, to traverse the upper face of the work between .two of the teeth thereof,

thus truing or removing all uneven surfaces or irregularities on tllG SldGS of the teeth with pushed in and rocked in thewhich it coacts, it being understood, of

course, that the rim of the grinding-wheel is shaped to conform exactly to the desired shape of such space. When the grindingwheel has traversed the face of the work the 65 surfaces to the" reduced surfaces f of the ass,

movement of the carriage is reversed andthe wheel thereby returned through the same grooveor space of the work to its origina point of starting; As the carriage .5 nears its limit of rearward movement the screw 11 carried by the arm 1O hascontact with an alining stationary portion of the frame 1*, thus effecting an oscillation of said arm and causing the dog or pawl 9 carried 10 thereby to engage and impart a fraction of a revolution to the ratchet-wheel 8 and screw 7 to which said wheel is fixed and effecting a very slight lowering of the grinding-wheel. The lowering mechanism is so regulated and adjusted that the movement imparted to the grinding-wheel is only sufficient to allow for the necessary trimming of the wheel in order to true it after a grindingoperation. The grindin -wheel having been lowered, the

idler-r0 l 20 enters the neutral zone a of the cam-groove 21, thus causing a slight pause of the carriage 3 before again starting on its forward movement Durin such pause the sliding-sleeve {33 on the sha t 46 strikes the extended end of the conical collar 45, moving it forward against the tension of the compression-s ring. 47 and effecting an elevation of the push-rod 44 due to the coaction of its lower end with the ,conicalsurface of the collarf This raising of the rod imparts simultaneous rocking movements to the two year-trimmer diamond-holders 39, through the medium of the shafts 38 and arms 43', and causes the rear trimmer-diamonds 40 to move upward in unison in arcs concentric to the arcs a, a ,of the grinding-wheel whereby to trim such surfaces preparatory to said wheel truing the suceeding groove or space in the gear-wheel being operated on to that 40 trued in the previouso eration. After the push-rod 44 has been e evated the idler roll 20 enters the diagonally-dis osed portion b of the guiding-groove 21 w 'ch causes the carriage to move forward a sufficient distance 45 for the axis of the grinding-wheel to stand in vertical 'alinement with the front trimmerdiamonds 49 of the trimming mechanism. At this point the idler-roll 2Q enters the second neutral zone 0 of the groove 21, causing the carriage td again-pause in its movement, during which pause the finger 60,. carried by the drum 18, coactswith the pin 59 carried by the shaft 46. As the finger strikes the pin' the shaft 46and collar 48 thereon are'rocked sufliciently to throw the cam projection 48 on said collar under the lower end of the plunger' or push-rod 51, whereby to raise said plunger in position for thetrimmendiamonds 49 carried at its up er endto coact with the'periphery or bead 50f the grinding-wheel. r 1

I At approximately the point of contact of the diamonds 49 with the grinding-wheel'the' idler-rolls 58'pass abruptly from the raised arms 52 of the plunger, thus permitting the diamonds 49 to have a diverging movement transversely of the narrow face or bead b of the rapidly revolving grinding-wheel, whereby to effect a smooth and even trimming of such surface. Upon a release of the two push-rods 44 and 51 they are, respectively, actuated by the springs 44 and 54 to, return to their normal lowered positions. A manual raising of the rods 44 and '51 may be effected by moving the shaft 93 in or out, respectively, and pressing down on the handle 98 so that the arms 94 will coact with the pin 95 on the rod 44 or the arm 96 will coact with the pin 97, as the case may be, and effect a raising of the respective rods. Near the limit of rearward movement of the carriage 3 the disk 7.6 receives a partial revolution, due to the sliding-sleeve 83 on the shaft 46 striking and oscillating the lever 81. As the'disk is turned the idler-roll 85 carried thereby moves upon the raised cam-surface 86 of the pivoted arm 87, effecting a depression thereof and a consequent-disengagement of the member 90 from the registering notch in the index-wheel The arm 71, which is keyed to the shaft with the disk 76 and turnsitherewith, is adjusted relative to the screw carried by the member 72 so that it engagessaid screw immediately u on the release of the locking-member rom engagement with the index-wheel and efleets a raising of the rod 70 and a consequent partial rotation of the ratchet-wheel 66. As theratchetwheelis moved it engages the pawl 69 and 100 imparts the requisite movement to the index: wheel and arbor-shaft or mandrel 64 to rotate the gear-wheel 5 the-distance of one tooth, so that each groove of the gear-wheel is successively acted on, by the grinding- 106 wheel. Upon a release of the rod 90 it is elevated by the action of the spring 90.

While we have shown our trimming mechanism as associated with a particular style of gear-truing machine, we wish it under- 110 stood that we do not limit ourselves to its use in such connection, 'nor do we wishto restrict our invention to the articular con-'' struction or arrangement of t e arts shown and described, asobvious mod' cations will .115 occur to one skilled in the art. r Having thus described our invention, what we claim as new and desire to secure byvLetters Patent, is, r I

1. In a machine of theclass described, the 12 combination of a rotatable grinding mediu'm, means for imparting a reciprocatory movement to the grinding-medium, and mechanism for trimming the-grindingmedium at predetermined 'p ointsin its reciprocatory movement. ,2 r 2. The combination with the grinding-. mediumof a g'ear-truin machine, of mechanism operative to trimt e grinding-medium,

K and means cooperating with the mechanism for automatically imparting intermittent trimming movements thereto..

3, The combination (with the grindingmedium of a gear truing machine, of opposing trimmer-diamonds, a mechanism operative to' move said diamonds in the arcs of different circles whereby to trim the 0 posing marginal surfaces of the grinding-me ium.-

in the reciprocatory movement of the grinding-medium.

6. The combination with a reciprocally movable grinding-Wheel, of an oscillatory trimming member, and mechanism for effecting an oscillation of said member to trim the wheel at a predetermined point in the reciprocatory movement thereof.

7. The combination with a reciprocally movable grinding-wheel, of an oscillatory trimming member, mechanism for imparting a trimming movement to said member at a predetermined point in the movement of said wheel, and means for automatically operating said mechanism:

8.. The combination 'th the grindingwheel, and means for imparting a reci rocatoryi movement thereto, of an oscil atory trimming member and mechanism operated ,bysaid means for imparting an intermittent "oscillatory movement to said member to move it across the surface of the wheel to be trimmed.

9.. 'The combination with the grindingwheel, and mechanism for impartinga reclprocatory movement thereto, of an OSClllatory trimming member, and mechanism operated by said first mechanism for "automatically moving said members to trim the wheel at. a predetermined point in its reciprocatory movement.

10. The combination with the. grindingwheel, having its peripheral portion shaped to suit the work to be opegated on, of tr1mmer means movable to tri'mithe operating surface of the wheel, and mechanism for imparting movement to said means.

' 11. In a gear-truing machine, the combination of a rotary.grindingwheel, the reciprocatory mount therefor, the trimmer memhers-movable relative to the wh'eel'to trim the side operating surfaces of the same, and

mechanism for, imparting trimming movements to said members ;at a predetermined point in the reciprocatory movement of the wheel.

12. The combination with a grindingwheel and mechanism for imparting a reciprocatory Inovem'ent thereto and causing it to ause at a pointin such movement, of members for trimming opposing surfaces of the wheel during the pause thereof, and mechanismfor imparting the trimming movements 'tosaid members.

13. The combination with the grindingwheel, of a plurality of trimmer members adjustable relative to the wheel and each other, and mechanism for imparting trimming movements to said members.

14. The combination with a rindingwheel having opposed grinding-surfaces describing the arcs of different, circles, of trimmer-members having trimming movements in arcs concentric to said surfaces,'and mochdium, of opposed trimmer-member's, and

mechanism operative to move said members in unison to simultaneously operate to trimopposed marginal portions of the grindingmedium, substantially as described.

16. The combination with a grinding-medium, of opposed trimmer-members movable in the arcs of circles to simultaneously operate on different surfaces of the grinding-medium, and mechanism for intermittently mqving said members for such purpose.

17. Thecombination' with a rotary grind. ing-medium,. of opposed trimmer-members movable to simultaneously operate on different surfaces of the grinding-medium, and

mechanism for intermittently moving said members for such purpose.

18. The combination with a rotary grind.- ing-medium, of an oscillatory trimming member, and mechanism for automatically effecting an intermittent oscillation of said member to move it across the surface of the medium to be trimmed.

19. The combination with a reciprocatory grinding-wheel having opposing arc-shaped grinding surfaces, of trimmer members adjustable relative to the heel and movable in arcs concentric to said'surfaces whereby to trim the same, and mechanism for effecting a positivemovement of said members at a predetermined point in the reciprocatory movement of the wheel.-\ i

20. The combination with a grinding-,.

wheel, and means forimparting a reci rocatory movement thereto, of a rock-s aft contiguous to the'wheel, a trimmer member adjustably carried by said shaft, and mech- 'anisnri for rocking said shaft to effect a movement of said member to trim a portion of the wheel operating surface at a predetermined point in the reciprocatory movement of the wheel.

' and -means for imparting tory trimmer-member, a ush-rod having I 21. In a gear-truing machine, the combination with thegrind1ng-wheel, the longitudinally-movable carriage carrying he same, a broken movement to the carria e, of oscillatory trimmermembers, and medlianism for operating said members'to trim the working surfaces of the wheel during a'pause in the movement of the 'carria e.

22.' n a gear-truing machine, the combination withthe grindmg-wheel, the reciprocatory carriage carrying the wheel, and the mechanism for moving the carriage, of a pair of trimmer-members, a ush-rod having connection with and mova le to rock said members, andmeans for effecting a movement of said rod at a redetermined point in the movement of tl ze carriage whereby to trim the working surfaces of the wheel.

23; In a-gear-truing machine, the combination with a grinding-wheel, of an oscillaconnection with and movab e to effect an oscillation of said member to trim the wheel,

- and' means for imparting an intermittent movement to said rod 24. In a gear-truingmachine, the combi-' nationwith a grinding-wheel, of an oscillatory trimmer-member, a rock-shaft carrying said member, a rod having connection with and movable to rock said shaft, and means for imparting a properly timed movement to said rod whereby to move the trimmer-members to trim thewheel.

25. In a gear-truing machine, the combination with a grinding-wheel, of a plurality of .wheel, of trimmer members movable to trim I oscillatory trimmer-members movable in the arcs of different circles, an element having connection with and movable to im'art a unitarymovement to said members W ereby bination with a reciprocatory grinding-medium, of-socketsadjustably mounted adjacent the path of movement of said medium, bearing members carried by said sockets,-

shaftsjournaled in said members, trimmer means laterally projecting from the shafts in position to trim the medium when the shafts are rocked, means movable to impart aunitaryrocking motion to-the shafts, and

mechanism for intermittently moving said means; I

27.The combination with a grinding,-

wheel, of a bifurcated member, trimmer mean s carried-by the furcations thereof,

mechanism for moving the member into and .out of'operative.position, and means cooperating with said members to move thetrimmer means transversely of the wheel. 11 28. The combination with a grindingmemb the face of the wheel, and mechanism for imparting opposed trimming movements to said members.

29. The combination with a grinding wheel, of trimmer members having their trimming movements transversely of the wheel periphery, and mechanism for imparting opposed trimming movements to said ers.

30. The combination with a rindingwheel, of means movable transverse y of the periphery thereof -to trim the same, and mechanism for automatically imparting intermittent trimming movements to said means.

31-. The combination with a grindingwheel, of a member having parts carrying trimmer means for operating on the wheel,

and mechanism for imparting opposed trimming movements to said parts.

32. Thecombination with a reciprocatory grinding-wheel, of a reciprocatory element, means carried by said element for trimming the wheel, and mechanism for moving said element in position for said means to engage the wheel at a predetermined point in the reciprocatory movement of the wheel.

33. The combination with'a reci rocatorygrinding-wheel, of means movab e transversely of'the. periphery thereof to trim the same, and mechanism for moving said means at redetermined points in the reciprocation of t 1e wheel.

34'. The combination with a reciprocatory ghinding-wheel, of a reciprocatory element, trimmer-means carried by said element in position tdtrim the wheel when the element is moved from normal position, and mechanism for imparting movement to said element whereby to trim the periphery of the wheel.-

35. The combination with the grindingwheel, and mechanism for imparting reciprocatory movement thereto, of a reciprocatory element, trimmer-means carried by said 'ried by each part, mechanism'for moving said elementin position for the trimmer-means to simultaneous engage the wheel, and means for imparting relative lateral movementsfto said parts. I

37. The combination. with the grindingthe grindingwheel, .of an element movable relative to the wheel and having relatively movable parts, trimmer-members carried by said parts,

mechanism for moving the element in posi-- tionfor'the trimmer-members to en age the wheel, and means for imparting 'relative movements to said parts when the element is moved.

38. The combination with the grindingwhecl, of an element movable relative to the wheel and having an end thereof bifurcated,

' trimmer-members carried by the bifurcated end of said element, mechanism for moving the element in position for the trimmermembers to engage the wheel, and means for causing the trimmer-members to have relative lateral movements during their engagement with the wheel.

39. The combination with the grindingwheel, of an element movable relative to the wheel and having a bifurcated end, trimmermcmbers carried by said end, means for moving the element in position for the trimmer members to engage the wheel, means for normally retaining the element in retracted position, and means coacting with the bifurcated arms of the element for causing a converging movement thereof when moved from the Wheel and permitting a spreading thereof when the trimmer members are in engagement with the wheel.

40.- In combination, a grinding-wheel, a

plunger movable relative tliereto,'trimmer means carried at one end of said plunger, a cam member coactmg with the other end of sald plunger and movable-to effect a coactlon of the trimmer-means foreifecting a properly timed movement of said cam memberduring a running of the machine.

41. The combination with a grindingwheel, and the mechanism for imparting movement thereto other than its rotary movement, of a plurality of sets of trimmermembers, and mechanism for imparting differently timed trimming movements to said sets of members whereby to trim the wheel at diflerent points in its movement.

42'. The combination with a reciprocatory grinding-wheel, of a plurality of independent trimmer-means, and mechanism for causing said trimmermeans to successively act on the wheel to trim the Working surfaces thereof at different points in the reciprocation.

43. ,The combination with a grindingmedium, of oscillatory trimmer-means, -re

ciprocatory trimmer-means, and mechanism for imparting the respective trimming movementsto said oscillatory and reciprocatory means. v 44. The combination with a grindingwheel, of oscillatory trimmer-members, re-

.ciprocatory trimmer-members, and mechanism for imparting differentially timed trimming ovements to the respective members.

45. The combination witha, grindingwheel, of-a set of oscillatory trimming-members, a second set of trimming-members movable toward and away from the wheel and having lateral trimming movements, means for effecting a relative lateral move ment of the second set of members, and mechanism for imparting successive move- '65 ments to the two sets of trimming-members.

46. The combination with a reciprocatory carriage, e grinding-wheel carried thereby and mechanism for imparting a broken movement to the carriage, of separate wheel trimming-means and mechanism for sucessively operating said trimming-means to act upon the wheel during difl'erent pauscsin its reciprocatory movement.

47. The combination with agrinding- Wheel having the work coacting surfaces (1., a

and b, of mechanism operative to effect a' simultaneous trimming of the surfaces 0, a, and mechanism operative to effect a trimming of the surface I) and means for impart ing trimming movements to said two mechanisms.

48. The combination with a grindingwheel having the work coacting surfaces a, a and b, of means movable to effect a simultaneous trimming of the surfaces 11-, a, means movable to efieot a trimming of the surface I), and mechanism for imparting differentially timed trimming movements to 'said two trimming-means.

49. The combination with a grmdmgwheel having curved and plain work coacting surfaces, of trimmer-means movable in arcs concentric to the curved surfaces of the. wheel to trim the'same, trimmer-means movable to trim the plain surface of the Wheel, and mechanismfor automatically imparting differentially-timed trimming movements m1 said two trimmer-means.

50. The combination with a grinding- Wheel, of trimming-members movable in the arcs of different circlesrelative to the wheel, a reciprocatory element having relatively movab e parts, trimmer-members carried by said parts and movable thereby laterally of Y the wheel whereby to trim its-. periphery, means movable to impart a trimming movement to the first mentioned trimming-members, and mechanism for imparting differentially-timed movements to said means and element.

'51. The combination with a grindingwheel and a trimming-mechanism of mechanism for automatically effecting a relative adjustment of the Wheel and trimming mechanism after each grinding operation.

52. The combination with a grindin wheel and a trimming-mechanism therefo of means for automatically causing a relative predetermined converging movement of the wheel and trimming mechanism after each grinding operation. 4

53. The combination with a carriage, a grinding-wheel carried b mechanism for trimming t e wheel, of means movable by a movement of the carriage to effect a relative adjustment of the wheel and trimming mechanism.

54. The combination with a movable carriage, a grinding-Wheel adjustably carried the carriage, a

thereby, and mechanism for trimming the p the bracket, a trimming mechanism, a screw bracket to efiect an adjustment thereof when wheel at a predetermined pomt in'the movement of the carriage, of means operated by the movement-of the carriage to effect a wear compensating adjustment of the wheel prior to each trimming operation.

55. The combination with a stationary frame, a movable carriage, a grinding-wheel adjustably carried thereby, and a wheel trimming mechanism, of means carried by the carriage for effecting a relative adjustment of the carriage and wheel, said means being operated by contact with the frame at a predetermined point in the movement'of the carriage. I 56. In combination, a movable carriage, a bracket adjustabl-y carried thereby, a grinding-wheeljournaled-in the bracket, a trimming mechanism, and means for effecting an adjustment of the'bracket at a predetermined point in the movement of the carriage whereby the wheel and trimming mechanism have relative adjustment.

57. In combination a stationary frame, a movable carriage, a bracket adjustalrly carried thereby, a grinding-wheel journaled in carried by the carriage and coa ting with the the screw is turned, a ratchet-wheel fixed to the screw, a ivoted arm associated w iththe ratchet-whee and adapted to have contact with and bemoved by the frame at a predetermined point in the movement of the carriage, and a pawl carried by the arm in position to engage and turn the ratchetwheel when said arm is oscillated.

58. In combination, a movable carriage, a grinding-wheel carried thereby, oscillatory wheel-trimming members, a push-rod having connection with and movable to effect an oscillation of said members, a shaft, a conlcal collar slidingly carried by the shaft and in-- tended when moved from normal osition to effect areciprocation of the pus 1-rod,' a

rotary drum having a circumferential camgroove, means carried by the carriage and operating in the groove whereby movement is imparted to the former, and means having its movement controlled by the cam-groove and sliding on said shaft to effect a movement of the conical collar at a predetermined point in the movement of the carriage where- .by to operate the trimming mechanism.-

59., In combination a movable carriage, a grinding-wheel carried thereby, two sets of members movable to'trim the wheel, a shaft, a sliding member on the shaft movable to effect a trimming movement of one of said members, acam rotatable with the shaft to impart a trimming movement to the other of said trimming members, means slidable on the shaft to coact with and move said sliding member, and a rotatable element for impart ing both a sliding movement to said means and a rocking movement tothe shaft.

60. In combination, a grinding-wheel having its periphery fashioned to conform to a groove between the teeth of a gear-wheel, a plurality of trlmmer means for acting on the sides and peripheral portion of part thus" fashioned, am mechanism for imparting trimming movements to said means, substantially as described. 61. The combination with a grindingwheel, of a movable carriage therefor, mechwheel, of a movable carriage therefor, mechanism for trimming the grinding-wheel and a rotary drum having a cam groove which, when the drum is rotated, cooperates both with the carriage and with the mechanism for imparting the operative movements thereto. 63. The combination with a grindingwheel and a movable carriage therefor, of two sets of trimmer member s, mechanism for operating, both sets of trimmer members to trim the wheel at predetermined points in the movement of its carriage, and means co- 0 crating both with the carriage and with t e mechanism to impart the operative movements thereto.

64. The combination with a grindingwheel having the peripheral operating sur-. I

faces a a and b, and the movable mount for the wheel, of two sets of trimmer members, one set-adapted to operate on the surfaces 0 a and the other adapted to operate on the surface I), mechanism for causing said sets to o erate on the wheel at different points in t e movement of the carriage and means for effecting both a movement of the carriage and an operation ofthe sets of trimmer members.

65. The-combination with a reciprocatory grinding-wheel, of a set of oscillatory trimmer members for operating on opposed surfaces .of the wheel, a set of laterally movable trimmer members for operating on a periphery of the wheel and having opposed trimming movements, and mechanism for nnpartmg trimming movements to the members of each set at predetermined points in the re-.

ciprocatory movement of the carriage.

66. The combination with a reciprocatory grinding-wheel, of a set of oscillatory trimmer members and a set of trimmer members movable both radially of the wheel and transversely thereof, the trimming move ments of the reciprocatory members being opposed, and mechanism for imparting trimming movements to the members of each set.

67. The combination with a reciprocatory grinding-wheel, of a set of oscillatory trimming members, a push-rod cooperating yvith said members to effect a trimming movei'nent thereof, a second push-rod having relatively movable parts, trimmer means carried by said parts and adapted, when the rod is 'reciprocated, to have movements transversely of the wheel periphery, mechanism i for causing an intermittent reciprocation of the two push-rods whereby each operates on second push-rodto'eflect a lateral movement of the trimmer means carried by such parts when the rod is moved In testimony whereof we have hereunto 15 signed our names to this specification in the vpresence of two subscribin% witnesses.

FREDERI K A. WARD. WILLIAM N. TAYLOR? Witnesses:

C. W. OWEN, CORNELL SCHREIBER. 

